Pathetic and disappointing customer service

I have been trying to apply for a credit limit increase from your branch at Liberty Promenade Mitchells Plain for the past month already. First the lady Ghakiema that assisted me fill in the form and 'sent' it off with my bank statements and when I called after 2 weeks to find out how much longer it will take I was told no paperwork was sent. Then on 14 feb I went back to the store and the manager Celest filled out the form and apparently sent it off. Then I get a message after 2 days that I did not sign the form and therefore it cannot be sent and I have to waste more time coming back to the store to sign it when I have signed this form infront of the manager and a witness of myself on that day so what they are trying to do is actually blame the customer for their pathetic and incompetence to do their job. Mind you they have also taken and kept my bank statements on 2 occasions and as I am aware because of your policy you are not allowed to do that I have a witness for that as well l. This needs to be addressed and the parties involved needs to be dealt with. I am aware of the lack of customer service in South Africa as I work in American customer services and the difference still socks me everyday. I want feedback of the outcome as this is just embarrassing I'm sure to your brand or its a norm and will continue.